FSK

FSK may refer to:


 * FSK (band), a German band
 * Federal Counterintelligence Service, (Russian Федера́льная Слу́жба Контрразве́дки; Federalnaya Sluzhba Kontrrazvedki) of Russia
 * Fiskerton railway station, in England
 * Forskolin, a diterpene
 * Forsvarets Spesialkommando, a Norwegian special forces unit
 * Fort Scott Municipal Airport, in Kansas, United States
 * Francis Scott Key Bridge (disambiguation)
 * Francis Scott Key High School, in Union Bridge, Maryland, United States
 * Freiwillige Selbstkontrolle der Filmwirtschaft, a German movie rating organization
 * Frequency-shift keying
 * Friends School Kamusinga, in Kenya
 * Kosovo Security Force, (Albanian: Forca e Sigurisë së Kosovës)